Clamp screw for saw swages



Oct. 19 1925 F. K. BENEfDlcT *11503,894

Patented 0d. 19, 1926.

UNITEE STElS P T E N 'I FFICE.

FREDERIC K. BENEDICT, 0F BIG RAIDS, TEICIIIGAN, ASSIGNOR TO HANCHE'IT SW'AGE WORKS, OF BIG RAPIDS, MICHIGAN, A CORPORATION OF MICHIGAN.

CLAMP SCREW FOB, SAW SVJAGES.

Application filed February 27v 1926.

This invention relates to saw swages of that class in which a head comprising a piece of metal of cylindrical or other suitable shape is formed with a slit to receive a saw blade and has a threaded hole therein at right angles tothe plane of the slit. In such swages a clamping screw is inserted in the threaded hole, and is tightened to clamp the saw, or loosened to release it, usually by a handle secured to a shank formed on the outer end of the screw.

The usual clamping `screw has heretofore been made in one piece, although it has more recently become customary in saw swage design to provide a separate saw-engaging head or cap on the inner end of the screw. The cap has been held in place, sometimes by means of a spring. and sometimes by an axial shank or spindle of small diameter that projects from the head and is somewhat loosely received in a hole bored longitudinally in the end of the screw, or, in some instances extending entirely through the screw from end to end.

In its broader aspect the inventive idea of my present improvement is concerned with a new and useful construction and arrange ment of the above mentioned parts, namely, the clamp screw and its cap.

More specifically, the present invention is found in my novel construction of the slightly articulated joint by which the saw-ens gaging end-member or cap is joined to the threaded body of the screw.

The function of my improved joint structure, as in all other such articulated joints, is to permit the screw to rotate freely with respect to the cap while enabling the latter to adjust itself to the face of the blade without rotating, to prevent marring the surface of the blade by cut-ting or denting.

In its preferable embodiment, described herein, my invention is adapted to accomplish the stated results in a better manner than has been done heretofore. This joint., which is of the ball-and-socket type, is so constructed that both the screw and the cap are rendered capable of beingmanufactured more accurately and economically, and can be assembled more easily and quickly by workmen of merely ordinary skill, than has been possible with the articulated joints above mentioned as having been previously devised for the clamp screws of saw swages.

Serial N0. 91,103.

l/Vith the foregoing and certain other objects in view, which will appear later in the specifications, my invention comprises the devices described and claimedand the equivalents thereof.

In the drawings, Fig. l is a front view', partly broken away, showing my improved clamp screw applied to the body of a saw swage.

Fig. 2 is a side view partly broken away, showing` the threaded part of the clamping screw.

Fig. 3 is an end view of the part shown in Fig. 2.

Fig. e is a side View of the saw-engaging cap-member of the clamp screw.

Fig. 5 is a side view, partly broken away, showing the device assembled. Referring now to the details of the drawings by numerals, l represents the head of a saw swage, formed as usual, with a slit to receive a saw blade. The head is formed with an aperture, threaded and communicating with the slit at right angles to the plane of the slit. In the threaded aperture is the saw-clamping screw having its main part or body 2 threaded, and its outer end or shank formed to receive an operating handle, not shown.

The inner end of screw 2 carries the ariculated cap d that engages the saw 5 to clamp it in the head 1.

'lhe joint structure will now be described. in axially projecting tubular shell is formed on the inner end of screw body 2, and the base of the tubular shell is formed with a substantially hemispherical socket 7 to ree ceive a suitable ball, as shown in Fig. 5.

The articulated cap structure, as shown in Fig. fl, consists in the flat faced saw-engaging` member 1l, formed with a shank 8, that preferably is tapered as at 9, having its greatest diameter at its outer end. The large end of shank 8 is rotatably received in the tubular shell 6, and a ball socket 10, formed in the end of the shank receives the ball as in Fig. 5. The outer edge or rim of shell G is then peened or rolled or pressed inwardly at places adjacent the reduced part of taper 9, whereby the shank 8 is retained and the cap 4lis held in freely rotatable and slightly articulated relation to screw 2.

My improved ball joint is thus seen to include in its construction a novel ball-seat shank on the saw-engaging cap, wherein 'the shank is tapered to secure more freedom of articulating movement in order to insure a fairer clamping eiect upon the face of the saw blade.

Moreover, my improved construction of the end of the screw enables the larger end of the tapered shank on the cap to be snugly received in the tubular shell which. I form in the end of the screw, and When the shank isy for-ced. farther into the opening, during` the act ofv clamping, so as to takeits seat upon the ball, the taper permits the shank to litr loosely in the'A tubular shell. There is practically no tendency to rotate when the` screw. is rotated to clampV thesaw blade,- and.V the saivengaging cap can not b ind on` the screw.

When `the cap is assembled with, the threaded, body to forni the completed clamp screw, andl the device is screw-,ed into position to clamp a saw blade. the saw-engaging.i can fairly and flatly seats-itselrfnnon the side of the blade. lVhile trie screw isibengset up tight,r therev is` ne grinding ofl the screw end intothe saw blade. andI no tendency forgit toturn, twist, and out or indent its Way into the, blade, y

Theconstruction and arrangement. of the parts; enables-them to be made. andl assembled cheaplyl and quickly inl quantity production.

Ijlavingr` thus described my invention,

what I claim and desire to secure by Letters Patent is:

l. In a swagehaving a head formed with a slit to receive a saw blade and having an aperture threaded and communicating,r with said slit at right angles to the plane thereof, a saw-clamping. screw in said threaded aperture,a tubular4 shell on the inner end of said screw, the screw formed with a socket at the base of. the tubular shell, a ball seated in said socket, a saw-engaging cap formed with ashank having' its greatest diameter at its outer. end and rotatably received in said tubular shell, the end of said shank formed with a ball socket, the rim of said shell proiecting;l inwardly at places adjacent the ree.

ducedfpart of saidshank, whereby the shank is retained. andthe cap is held in rotatable and slightly articulated relation to said screw.

In a smv swage, a clamping seres7 havin a` a bearing cap thereon, 'an articulated ball-joint connection between said screw and can, said connection, including a tapered shank on said cap, a tubular member on said screw, to receive said tapered shank` a ball seated betufeenthe ends of said screw and shank, the riml of said shell formed with an inwardly projecting part adapted to retain said tagered shank, for the purposes set forth.

In testimony. whereof, I affix mv signature.

riteniamoy K, 'nummer 

